Propeller.



A. J. DENTREMONT.

PROPELLER.

APPLICATION FILED SEPT. 20. I915.

1,210,611. 7 I Patented Jan. 2,1917.

2 SHEETSSHEET I.

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ABRAHAM J. DENTREMONT, OF WEST-PUIBNIGO, NOVA SCOTIA, CANADA.

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Specification of Letters Patent.

Patented J an. 2, 1917.

Application filed September 20, 1915. Serial No. 51,703.

To all whom it may concern:

Be it known that I, ABRAHAM J. DENTRE- MONT, a citizen of the Dominion of Canada, residing at West Pubnico, in the county of Yarmouth, Province of Nova Scotia, Canada, have invented certain new and useful Improvements in Propellers, of which the following is a specification.

This invention relates to propellers, which consists of a pair of blades, a body member and connecting member between saidblades and body member.

The object of the invention is to provide a propeller having more force.

A further object is to provide a propeller which will rapidly pick-up speed.

A further object is to provide a propeller which will stop quickly.

With these and other objects in view, my invention consists in the novel construction, combination, and arrangement of parts to be hereinafter more fully described, claimed and illustrated in the accompanying drawings, in which,

Figure 1 shows a perspective side view of my invention. Fig. 2 shows a perspective side view of a launch with my invention thereon. Fig. 3 shows a perspective side view of my invention. Fig. 4: shows a perspective end view of my invention.

Similar numerals refer to similar parts throughout the several views.

5 designates the rear end of a launch with my invention shown in position. This propeller can be used on any kind of launches, ships, boats or other water-going craft.

6 is the driving-shaft coming through the end of the boat from the engine. This driving-shaft 6 may be of any desired type as it does not form a part of this invention.

7 is the hub of the propeller having a hole drilled through its center lengthwise for the drive-shaft 6. It is securely attached to the drive-shaft 6 by means of the pins 8. This hub is cylindrical in shape, having its largest circumference near the center. It gradually tapers to the rear end but cuts off abruptly. The front end gradually tapers down so that no resistance will be caused when. going through the water. If it were cut off abrupt similar to the rear end, there would be a flat face for the water to strike which would cause resistance.

9 are the set of blades. These blades are provided with connecting members 10. The hub 7, the blades 9 and the connecting members 10 may be all made in one piece by casting as'shown in Fig. 1, or it may be as shown in Fig. 3. That is the hub 7 is made separately. The'blades 9 and connecting members 10 are made together. The connecting members 10 are provided with flanges 11 which extend out on both sides at the end connecting to the hub 7. These flanges 11 have orifices therein through which the bolts 12 pass into threaded holes in the hub 7 In the latter case a blade may be taken off easily and a new one put on, if the first one becomes damaged. The hub and other blade may be perfectly good and this will mean quite a saving.

The blades 9 are positioned on the hub 7 at right-angles to each other. By having them in this position great power can be had, also, they will be quick in starting and stopping. It will also be noticed by looking at Fig. 1 that the connecting members 10 do not follow each other, thus, the water in the center is not churned but is cut through and all power comes from the blades.

What I claim as new, is

A propeller comprising a hub, a pair of blades, each of said blades being connected directly to the hub by a pair of spaced arms lying in the same plane as the body of the blades, each of said arms having a flange extending from each side of the lower edge thereof in the direction of length of the arms, said flanges having a series of apertures therein whereby said blades may be detachably secured to said hub and also providing an unobstructed passage through the center of said blades whereby the water passing therethrough will not be churned.

In testimony whereof I afiix my signature in the presence of two witnesses.

ABRAHAM J. DENTREMONT.

Witnesses JoHN J. CAMERON, NORMA RAYMOND.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington. D. 0- 

